Waiting period. Jeff, a local traffic engineer, has designed a new pedestrian foot bridge that is capable of handling the current traffic rate of 250 pedestrians daily. Once the traffic rate reaches 2,000 pedestrians daily, however, the bridge will require a new bracing system. Jeff has estimated that traffic will increase annually at 5%. How long will the current bridge system work before a new bracing system is required? What if the annual traffic rate increases at 10% annually? At what traffic increase rate will the current system last only 10 years? If the traffic rate increases at 5% annually, how long will the present bridge system work before a new bracing system is required? years (Round to two decimal places.)